Polyurethane insulated steel pipe is an important application pipe, which plays an important role in energy and heat supply, so its quality requirements are particularly strict. Before leaving the factory, it must be tested, which mainly includes steel pipe specification, steel pipe material, insulation layer thickness, etc.
As far as the current installation situation is concerned, polyurethane insulated steel pipe does not need a special trench, but can be directly buried in the soil. The insulation and anti-corrosion effects are incomparable with other pipes. In addition, polyurethane insulated steel pipe has a certain energy-saving effect due to its outstanding insulation effect. For the same kind of pipes, good insulation effect can reduce the heat loss in the transportation process to achieve the purpose of energy conservation.
According to the calculation and actual use of relevant departments, 1 km polyurethane insulated steel pipe can save 10 tons of coal annually compared with other pipes. If all heating pipes are polyurethane insulated steel pipes, a large amount of coal can be saved every year, which not only saves the cost but also protects the environment.
Standard for quality inspection of polyurethane insulated steel pipe
Tsgd0001-2009 supervision code for safety technology of pressure pipeline - industrial pipeline
Tsgd2001-2006 pressure pipe components manufacturing license rules
Tsgd2002-2006 type test rules for pressure piping components
GB / t20801.1-6-2006 pressure piping code industrial piping
Technical standard of SY/T0415-96 rigid polyurethane foam plastic insulation coating for buried steel pipeline
SY / t5037-2000 code for construction and acceptance of spiral submerged arc welded steel pipe for low pressure fluid transportation gb50236-98 field equipment industrial pipeline welding engineering
Gb8923-88 rust grades and derusting grades of steel before coating
Sy0063-92 leakage test method of pipeline anticorrosive coating
CJJ / 28-2004 code for construction and acceptance of urban heating pipe network engineering
GB / T9711.1-1997 Technical delivery conditions of steel pipes for petroleum and natural gas industries grade 1A steel pipes
SY / t5037-2000 spiral submerged arc welded steel pipe for low pressure fluid transmission
Steel butt welded seamless pipe fittings (GB / t12459-2005)
Steel plate butt welded pipe fittings (GB / t13401-2005)
GB2828 sampling table of sampling procedure set for step by step inspection
Requirements of polyurethane insulated steel pipe for production environment
1. Wind factor: when spraying, the wind speed is required to be less than 5m / s. Because the wind speed exceeds 5m /s, the heat generated by the reaction will be lost, which will affect the rapid foaming reaction of the polyurethane foam and make the surface of the product brittle. At the same time, because the spray foaming machine will mix the raw materials and spray them out in the atomized state, if the wind speed is too high, the atomized particles will be blown away, the loss of raw materials will be increased, and the environment will be polluted.
2. Temperature factor: during spraying, the field ambient temperature and the surface temperature of the substrate to be sprayed shall be within 15 ℃ ~ 35 ℃. If the temperature is too low, the adhesion between polyurethane foam and base material will be reduced, and the density of the product will increase obviously. If the temperature is too high, the foaming agent will lose too much and is not economical.
Polyurethane insulated steel pipe production site
3. substrate surface factors: polyurethane rigid foam is a polymer product produced by mixed reaction of isocyanate and combined polyether, and the isocyanate component is easily reacted with water to form urea. If the content of urea bond in polyurethane increases, then the foamed plastics will become crisp and the adhesion between foam and substrate will be reduced. Therefore, the surface of the substrate to be sprayed shall be clean and dry, without rust, dust, pollution and moisture. If there is dew or frost, it should be removed and dried.
In the construction of polyurethane foam insulation pipeline, some situations can not be reversed. When installing polyurethane foam insulation pipeline, the correct method should be used. If there is one mistake, it can not show its function well. So in terms of redundant pipeline insulation technology, it can bring a lot to the domestic economy by analyzing its development trend in the future Influence.
